GM is celebrating it's centennial anniversary this year, and along with the planned hoopla, they've just come out with a list of their top ten production cars and top ten concept cars of the past hundred years. With such an enormous catalog of vehicles to choose from, both lists are open to massive debate, but for reasons of GMness, these are their 20 faves. It's interesting to note that the vast majority of the production choices occur in the first half of GM's 100 years, while the concepts are evenly distributed. Also interesting: A notable number of these cars weren't even under the GM umbrella at the time they were built. Anyway, on to the show...